The mother-of-three, 40, faces up to three years' jail over a visit to a Dayboro pub with Palmer, 57, and his accused clubmate Ronald Anton Germain, 50, on December 19. The trio, who are being held in the Pine Rivers watchhouse, are due to apply for bail in the Brisbane Magistrates Court on Thursday.

Task Force Maxima superintendent Mick Niland said Keuther had, like her male companions, worn a leather vest with club colours into the hotel, then told staff she was part of the gang. Her vest allegedly read: "Property of Crow".

Keuther's former husband Rolf said she did not know a bikie or even "have an inkling" of what an outlaw motorcycle club was about before she was introduced to Palmer.

"Nine months ago she didn't even know these jokers," he said.

His wife of five years had been a "regular mother who loves and dotes on her children" and led the lifestyle people expected of a council librarian, he said.

The only hint of wildness was the butterfly tattoos she kept well-covered when working at Carina and Stones Corner libraries.

Supt Niland said the decision to charge Keuther was based on what she wore, what she told bar staff and the fact she "made full admissions" to police she was a "participant".

"If she was a normal everyday partner and had no affiliation with the criminal organisation, she would not be a participant," Supt Niland said. "It's not the case we're targeting partners of bikies . . . she was being a participant in a criminal organisation by her actions on the day and what she said on the day, which was also followed by admissions.''

Paul Martin, a friend of Germain, said the bikie was a retired prison officer whose previous long career in the army included a stint as a United Nations peacekeeper serving in Cambodia.